FLOWLAB SOLUTION
8.140
Use the
expansion
FlowLab template to model viscous flow in a pipe that
contains a sudden expansion from radius
R
1
to
R
2
>
R
1
.
Conduct a parametric study to
investigate the effects of the expansion ratio,
R
2
/
R
1
, on the overall pressure drop,
∆
p
, in
the pipe.
Fix the entrance pipe geometry to a radius of
R
1
= 0.1 m and length of
l
1
= 1.0
m.
Also, fix the exit pipe length at
l
2
= 10.0 m.
Set the density, viscosity, and inlet
velocity to maintain a constant Reynolds number of Re = 20,000 for all simulations.
Run
simulations for expansion ratios of
R
2
/
R
1
= 2.0, 2.5, and 3.0.
Examine the overall
pressure drop in the pipe from inlet to outlet, as well as the outlet velocity.
Using
concepts studied in this chapter, explain the trends in the pressure drop and outlet
velocity.
Problem Setup
For this fixed Reynolds number, the flow was set to turbulent and the Boundary
Conditions and Materials settings were adjusted to give Re = 20,000 as shown.
The fine grid mesh density was selected for all of the simulations.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
This is the end of the preview.
Sign up
to
access the rest of the document.
 Spring '08
 all
 Fluid Dynamics, pressure drop, 0.1 m

Click to edit the document details